^ Yeah, if I really, really cared that another patron in a country club dining room was flouting the dress code (and it's not necessarily bad to really, really care about such a thing in that setting), maybe-maybe-I'd have a small chat with the restaurant manager after my meal: I'd ask him/her how come the dress code wasn't being enforced. [Correction: If I were a longstanding member of the club, I'd probably have the chat.] But that's all-a chat. I wouldn't interrupt my meal so that I could arrange for the under-dressed diner to be ejected from the room. That would be going a little too far.
Now if that person were to crash his jalopy into my table, thereby knocking my Shrimp Louis into the lap of my new linen trousers from Ben Silver....